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Adding Resistors in Parallel

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ANSWER: D– 10/7

Resistors in parallel add via: 1/Req = 1/R + 1/R…

1/Req = 1/2 + 1/5

Finding a common denominator: 5/10 + 2/10 = 7/10 = 1/Req

Flipping it to attain Req = 10/7Ω